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Streamflow depletion signatures, temperature impacts


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Created: Nov 06, 2023 at 10:53 p.m.
Last updated: Jul 10, 2024 at 5:50 p.m.
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Abstract

This repository is the supplemental code and data for the publication title: Potential impacts of groundwater pumping on stream temperature are greatest in streams with substantial cold groundwater inflows

Groundwater pumping-induced reductions in streamflow (known as ``streamflow depletion") have been documented worldwide, but potential impacts of streamflow depletion on water quality indicators like stream temperature are not well understood. Here, we aim to identify potential impacts of pumping on stream temperature across the conterminous United States (CONUS) to determine which aspects of a stream's annual thermograph, which we term thermohydrologic signatures, can be used to monitor and manage streamflow depletion impacts on stream temperature. We used long-term streamflow and stream temperature data from 46 streamgages across CONUS and archetypal models of streamflow depletion to analyze stream temperature impacts for dry, average, and wet conditions at each site. We compared two different stream temperature modeling approaches: (i) a 1-D energy balance model and (ii) statistical regression models based on air temperature and stream discharge. We calculated a suite of thermohydrologic signatures under depleted and non-depleted conditions for each stream and found that maximum annual 7-day temperature and annual temperature range are most sensitive to streamflow depletion, with potential changes of at least 2C at >50% of the sites when using the physically-based model. We also found that the regression-based models predicted much less sensitivity of stream temperature to streamflow depletion than the physically-based model. Potential impacts were then estimated for 8,933 streamgages across CONUS using random forest models developed for each thermohydrologic signature. Potential streamflow depletion impacts on maximum 7-day temperatures are most common in northern CONUS where groundwater temperatures are cold (<15C) and baseflow index is high ($>$50\%). This work provides a systematic evaluation of the potential impacts of streamflow depletion on stream temperature. We demonstrate that streams with a high proportion of flow sourced from relatively cold groundwater inputs are most sensitive to stream temperature impacts, and that regression-based stream temperature models may underpredict stream temperature changes caused by streamflow depletion.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Conterminous United States
North Latitude
50.0000°
East Longitude
-60.0000°
South Latitude
18.0000°
West Longitude
-130.0000°

Content

Data Services

The following web services are available for data contained in this resource. Geospatial Feature and Raster data are made available via Open Geospatial Consortium Web Services. The provided links can be copied and pasted into GIS software to access these data. Multidimensional NetCDF data are made available via a THREDDS Data Server using remote data access protocols such as OPeNDAP. Other data services may be made available in the future to support additional data types.

How to Cite

Lapides, D. A., S. Zipper, J. Hammond (2024). Streamflow depletion signatures, temperature impacts, HydroShare, http://www.hydroshare.org/resource/954ebc6ec03340b5b96dd36a5aaf08bd

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/
CC-BY

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